//Export2Excel.js

/* eslint-disable */
require('script-loader!file-saver');
import XLSX from 'xlsx';

function generateArray(table) {
  var out = [];
  var rows = table.querySelectorAll('tr');
  var ranges = [];
  for (var R = 0; R < rows.length; ++R) {
    var outRow = [];
    var row = rows[R];
    var columns = row.querySelectorAll('td');
    for (var C = 0; C < columns.length; ++C) {
      var cell = columns[C];
      var colspan = cell.getAttribute('colspan');
      var rowspan = cell.getAttribute('rowspan');
      var cellValue = cell.innerText;
      if (cellValue !== '' && cellValue == +cellValue) cellValue = +cellValue;

      //Skip ranges
      ranges.forEach(function (range) {
        if (
          R >= range.s.r &&
          R <= range.e.r &&
          outRow.length >= range.s.c &&
          outRow.length <= range.e.c
        ) {
          for (var i = 0; i <= range.e.c - range.s.c; ++i) outRow.push(null);
        }
      });

      //Handle Row Span
      if (rowspan || colspan) {
        rowspan = rowspan || 1;
        colspan = colspan || 1;
        ranges.push({
          s: {
            r: R,
            c: outRow.length,
          },
          e: {
            r: R + rowspan - 1,
            c: outRow.length + colspan - 1,
          },
        });
      }

      //Handle Value
      outRow.push(cellValue !== '' ? cellValue : null);

      //Handle Colspan
      if (colspan) for (var k = 0; k < colspan - 1; ++k) outRow.push(null);
    }
    out.push(outRow);
  }
  return [out, ranges];
}

function datenum(v, date1904) {
  if (date1904) v += 1462;
  var epoch = Date.parse(v);
  return (epoch - new Date(Date.UTC(1899, 11, 30))) / (24 * 60 * 60 * 1000);
}

function sheet_from_array_of_arrays(data, opts) {
  var ws = {};
  var range = {
    s: {
      c: 10000000,
      r: 10000000,
    },
    e: {
      c: 0,
      r: 0,
    },
  };
  for (var R = 0; R != data.length; ++R) {
    for (var C = 0; C != data[R].length; ++C) {
      if (range.s.r > R) range.s.r = R;
      if (range.s.c > C) range.s.c = C;
      if (range.e.r < R) range.e.r = R;
      if (range.e.c < C) range.e.c = C;
      var cell = {
        v: data[R][C],
      };
      if (cell.v == null) continue;
      var cell_ref = XLSX.utils.encode_cell({
        c: C,
        r: R,
      });

      if (typeof cell.v === 'number') cell.t = 'n';
      else if (typeof cell.v === 'boolean') cell.t = 'b';
      else if (cell.v instanceof Date) {
        cell.t = 'n';
        cell.z = XLSX.SSF._table[14];
        cell.v = datenum(cell.v);
      } else cell.t = 's';

      ws[cell_ref] = cell;
    }
  }
  if (range.s.c < 10000000) ws['!ref'] = XLSX.utils.encode_range(range);
  return ws;
}

function Workbook() {
  if (!(this instanceof Workbook)) return new Workbook();
  this.SheetNames = [];
  this.Sheets = {};
}

function s2ab(s) {
  var buf = new ArrayBuffer(s.length);
  var view = new Uint8Array(buf);
  for (var i = 0; i != s.length; ++i) view[i] = s.charCodeAt(i) & 0xff;
  return buf;
}

export function export_table_to_excel(id) {
  var theTable = document.getElementById(id);
  var oo = generateArray(theTable);
  var ranges = oo[1];

  /* original data */
  var data = oo[0];
  var ws_name = 'SheetJS';

  var wb = new Workbook(),
    ws = sheet_from_array_of_arrays(data);

  /* add ranges to worksheet */
  // ws['!cols'] = ['apple', 'banan'];
  ws['!merges'] = ranges;

  /* add worksheet to workbook */
  wb.SheetNames.push(ws_name);
  wb.Sheets[ws_name] = ws;

  var wbout = XLSX.write(wb, {
    bookType: 'xlsx',
    bookSST: false,
    type: 'binary',
  });
  saveAs(
    new Blob([s2ab(wbout)], {
      type: 'application/octet-stream',
    }),
    'test.xlsx'
  );
}

//修改函数export_json_to_excel

export function export_json_to_excel({
  multiHeader = [],
  header,
  data,
  sheetname = 'sheet1',
  filename,
  merges = [],
  autoWidth = true,
  bookType = 'xlsx',
} = {}) {
  /* original data */
  filename = filename || 'excel-list';
  data = [...data];
  for (var i = 0; i < header.length; i++) {
    data[i].unshift(header[i]);
  }

  // data.unshift(header)

  for (let i = multiHeader.length - 1; i > -1; i--) {
    data.unshift(multiHeader[i]);
  }

  var ws_name = sheetname;
  var wb = new Workbook(),
    ws = [];
  for (var j = 0; j < header.length; j++) {
    ws.push(sheet_from_array_of_arrays(data[j]));
  }
  if (merges.length > 0) {
    if (!ws['!merges']) ws['!merges'] = [];
    merges.forEach((item) => {
      ws['!merges'].push(XLSX.utils.decode_range(item));
    });
  }
  // console.log("width", autoWidth)
  if (autoWidth) {
    /*设置worksheet每列的最大宽度*/
    var colWidth = [];
    for (var k = 0; k < header.length; k++) {
      let col = data[k].map((row) => {
        return row.map((val) => {
          /*先判断是否为null/undefined*/
          if (val == null) {
            return {
              wch: 10,
            };
          } else if (val.toString().charCodeAt(0) > 255) {
            /*再判断是否为中文*/
            return {
              wch: val.toString().length * 2 + 20,
            };
          } else {
            return {
              wch: val.toString().length + 30,
            };
          }
        });
      });
      colWidth.push(col);
    }

    /*以第一行为初始值*/
    let result = [];
    for (var k = 0; k < colWidth.length; k++) {
      result[k] = colWidth[k][0];
      for (let i = 1; i < colWidth[k].length; i++) {
        for (let j = 0; j < colWidth[k][i].length; j++) {
          if (result[k][j]['wch'] < colWidth[k][i][j]['wch']) {
            result[k][j]['wch'] = colWidth[k][i][j]['wch'];
          }
        }
      }
    }
    // 分别给sheet表设置宽度
    for (var l = 0; l < result.length; l++) {
      ws[l]['!cols'] = result[l];
    }
  }

  /* add worksheet to workbook */
  for (var k = 0; k < header.length; k++) {
    wb.SheetNames.push(ws_name[k]);
    wb.Sheets[ws_name[k]] = ws[k];
  }
  var dataInfo = wb.Sheets[wb.SheetNames[0]];

  for (var i in dataInfo) {
    if (
      i == '!ref' ||
      i == '!merges' ||
      i == '!cols' ||
      i == 'A1' ||
      i == 'B1'
    ) {
    } else {
      dataInfo[i + ''].s = {
        alignment: {
          horizontal: 'center',
          vertical: 'center',
        },
      };
    }
  }
  const borderAll = {
    //单元格外侧框线
    top: {
      style: 'thin',
    },
    bottom: {
      style: 'thin',
    },
    left: {
      style: 'thin',
    },
    right: {
      style: 'thin',
    },
  };

  dataInfo['A1'].s = {
    border: borderAll,
    alignment: {
      horizontal: 'center',
      vertical: 'center',
    },
    fill: {
      fgColor: { rgb: '99cc00' },
    },
  };

  dataInfo['B1'].s = {
    border: borderAll,
    alignment: {
      horizontal: 'center',
      vertical: 'center',
    },
    fill: {
      fgColor: { rgb: '99cc00' },
    },
  };

  var wbout = XLSX.write(wb, {
    bookType: bookType,
    bookSST: false,
    type: 'binary',
  });
  saveAs(
    new Blob([s2ab(wbout)], {
      type: 'application/octet-stream',
    }),
    `${filename}.${bookType}`
  );
}
